scholarly journals An ANN-Based Approach for Prediction of Sufficient Seismic Gap between Adjacent Buildings Prone to Earthquake-Induced Pounding

2020 ◽  
Vol 10 (10) ◽  
pp. 3591
Author(s):  
Seyed Mohammad Khatami ◽  
Hosein Naderpour ◽  
Seyed Mohammad Nazem Razavi ◽  
Rui Carneiro Barros ◽  
Barbara Sołtysik ◽  
...  
Keyword(s):  
Parametric Analysis ◽  
Structural Parameters ◽  
Seismic Gap ◽  
Minimal Distance ◽  
Lumped Mass ◽  
Seismic Excitations ◽  
Ground Acceleration ◽  
Earthquake Records ◽  
Adjacent Buildings ◽  
Structural Arrangements

Earthquake-induced structural pounding may cause major damages to structures, and therefore it should be prevented. This study is focused on using an artificial neural network (ANN) method to determine the sufficient seismic gap in order to avoid collisions between two adjacent buildings during seismic excitations. Six lumped mass models of structures with a different number of stories (from one to six) have been considered in the study. The earthquake characteristics and the parameters of buildings have been defined as inputs in the ANN analysis. The required seismic gap preventing pounding has been firstly determined for specified structural arrangements and earthquake records. In order to validate the method for other structural parameters, the study has been further extended for buildings with different values of height, mass, and stiffness of each story. Finally, the parametric analysis has been conducted for various earthquakes scaled to different values of the peak ground acceleration (PGA). The results of the verification and validation analyses indicate that the determined seismic gaps are large enough to prevent structural collisions, and they are just appropriate for all different structural arrangements, seismic excitations, and structural parameters. The results of the parametric analysis show that the increase in the PGA of earthquake records leads to a substantial, nearly uniform, increase in the required seismic gap between structures. The above conclusions clearly indicate that the ANN method can be successfully used to determine the minimal distance between two adjacent buildings preventing their collisions during different seismic excitations.

scholarly journals Predicting the peak structural displacement preventing pounding of buildings during earthquakes

2021 ◽  
Vol 2070 (1) ◽  
pp. 012010
Author(s):  
S M Khatami ◽  
H Naderpour ◽  
A Mortezaei ◽  
S T. Tafreshi ◽  
A Jakubczyk-Gałczyńska ◽  
...  
Keyword(s):  
Structural Model ◽  
Lateral Displacement ◽  
Critical Distance ◽  
Lumped Mass ◽  
Seismic Excitations ◽  
Ground Acceleration ◽  
Vibration Period ◽  
Adjacent Buildings ◽  
Artificial Neural Network Ann ◽  
Story Building

Abstract The aim of the present paper is to verify the effectiveness of the artificial neural network (ANN) in predicting the peak lateral displacement of multi-story building during earthquakes, based on the peak ground acceleration (PGA) and building parameters. For the purpose of the study, the lumped-mass multi-degree-of-freedom structural model and different earthquake records have been considered. Firstly, values of stories mass and stories stiffness have been selected and building vibration period has been automatically calculated. The ANN algorithm has been used to determine the limitation of the peak lateral displacement of the multi-story building with different properties (height of stories, number of stories, mass of stories, stiffness of stories and building vibration period) exposed to earthquakes with various PGA. Then, the investigation has been focused on critical distance between two adjacent buildings so as to prevent their pounding during earthquakes. The proposed ANN has logically predicted the limitation of the peak lateral displacement for the five-story building with different properties. The results of the study clearly indicate that the algorithm is also capable to properly predict the peak lateral dis-placements for two buildings so as to prevent their pounding under different earthquakes. Subsequently, calculation of critical distance can also be optimized to save the land and provide the safety space between two adjacent buildings prone to seismic excitations.

scholarly journals Determination of Peak Impact Force for Buildings Exposed to Structural Pounding during Earthquakes

Geosciences ◽  
2019 ◽  
Vol 10 (1) ◽  
pp. 18 ◽  
Author(s):  
Seyed Mohammad Khatami ◽  
Hosein Naderpour ◽  
Rui Carneiro Barros ◽  
Anna Jakubczyk-Gałczyńska ◽  
Robert Jankowski
Keyword(s):  
Ground Motion ◽  
Parametric Study ◽  
Structural Damage ◽  
Impact Force ◽  
Structural Parameters ◽  
Seismic Excitations ◽  
Ground Acceleration ◽  
Structural Pounding ◽  
Peak Impact Force

Structural pounding between adjacent, insufficiently separated buildings, or bridge segments, has been repeatedly observed during seismic excitations. Such earthquake-induced collisions may cause severe structural damage or even lead to the collapse of colliding structures. The aim of the present paper was to show the results of the study focused on determination of peak impact forces during collisions between buildings exposed to different seismic excitations. A set of different ground motion records, with various peak ground acceleration (PGA) values and frequency contents, were considered. First, pounding-involved numerical analysis was conducted for the basic parameters of colliding buildings. Then, the parametric study was carried out for different structural natural periods, structural damping ratios, gap sizes between buildings and coefficients of restitution. The results of the analysis conducted for the basic structural parameters indicate that the largest response of the analysed buildings was observed for the Duzce earthquake. The parametric study showed that the pounding-involved structural response depended substantially on all parameters considered in the analysis, and the largest response was observed for different ground motions. The results of the study presented in this paper indicate that the value of the peak impact force expected during the time of the earthquake does not depend on the PGA value of ground motion, but rather on the frequency contents of excitation and pounding scenario. It is therefore recommended that the peak impact force for buildings exposed to structural pounding during earthquakes should be determined individually for the specific structural configuration taking into account the design ground motion.

scholarly journals Mechanical Properties Research on Suspended-dome Structure with Discontinuous Support Under Different Parameters

2017 ◽  
Vol 11 (1) ◽  
pp. 303-314
Author(s):  
Yu Jinghai ◽  
Leng Ming ◽  
Zhang Zhongyu ◽  
Jiang Zhiyu ◽  
Wang Zhengkai
Keyword(s):  
Mechanical Properties ◽  
Parametric Analysis ◽  
Structural Parameters ◽  
Supporting System ◽  
Vertical Stiffness ◽  
Stiffness Constant ◽  
Support Reaction ◽  
Steel Consumption ◽  
Dome Structure ◽  
Scope Of Application

Introduction: For suspended-dome with big partial hole, two kinds of feasible plans were proposed. Method: One of the plans was to adjust suspended-dome’s members, and another to build auxiliary supporting system to support the suspended-dome with columns together. These kinds of suspended-dome’s main structural parameters include stiffness, member force, steel consumption, support reaction and stability, and parametric analysis is based on these parameters. Conclusion: Firstly,the scope of application was illustrated for the former plan. Then, an equivalent vertical stiffness algorithm was put forward for the latter plan. In the latter plan, limit stiffness constant was introduced to quantify the method for solving discontinuous support problem.

scholarly journals Integrated Design of Hybrid Interstory-Interbuilding Multi-Actuation Schemes for Vibration Control of Adjacent Buildings under Seismic Excitations

2017 ◽  
Vol 7 (4) ◽  
pp. 323 ◽  
Author(s):  
Francisco Palacios-Quiñonero ◽  
Josep Rubió-Massegú ◽  
Josep Rossell ◽  
Hamid Karimi
Keyword(s):  
Vibration Control ◽  
Integrated Design ◽  
Seismic Excitations ◽  
Adjacent Buildings

Configuration optimization of dampers for adjacent buildings under seismic excitations

2012 ◽  
Vol 44 (12) ◽  
pp. 1491-1509 ◽  
Author(s):  
Kasra Bigdeli ◽  
Warren Hare ◽  
Solomon Tesfamariam
Keyword(s):  
Seismic Excitations ◽  
Configuration Optimization ◽  
Adjacent Buildings

scholarly journals Advanced design of integrated vibration control systems for adjacent buildings under seismic excitations

2016 ◽  
Vol 744 ◽  
pp. 012163 ◽  
Author(s):  
Francisco Palacios-Quiñonero ◽  
Josep Rubió-Massegú ◽  
Josep M Rossell ◽  
Hamid Reza Karimi
Keyword(s):  
Vibration Control ◽  
Control Systems ◽  
Seismic Excitations ◽  
Adjacent Buildings

Pounding between Inelastic Three-Storey Buildings under Seismic Excitations

2015 ◽  
Vol 665 ◽  
pp. 121-124 ◽  
Author(s):  
Robert Jankowski
Keyword(s):  
Numerical Analysis ◽  
Numerical Models ◽  
Ground Motions ◽  
Permanent Deformation ◽  
Structural Response ◽  
The Other ◽  
Lumped Mass ◽  
Seismic Excitations ◽  
Structural Interactions ◽  
Inelastic Behaviour

Structural interactions between adjacent, insufficiently separated buildings have been repeatedly observed during damaging ground motions. This phenomenon, known as the structural pounding, may result in substantial damage or even total collapse of structures. The aim of the present paper is to show the results of the nonlinear numerical analysis focused on pounding between inelastic three-storey buildings under seismic excitations. The discrete lumped-mass numerical models of two building have been used in the analysis. The results of the study indicate that the response of the lighter and more flexible inelastic building can be substantially influenced by structural interactions, and collisions may even lead to the permanent deformation of the structure. On the other hand, the behaviour of the heavier and stiffer building does not really change considerably during the earthquake. The results of the study also indicate that incorporation of the inelastic behaviour of colliding buildings with different dynamic characteristics is very important for the purposes of accurate numerical modelling of pounding-involved structural response under damaging seismic excitations.

scholarly journals Seismic vulnerability assessment of a high-rise molten-salt solar tower based on incremental dynamic analysis

2020 ◽  
Vol 194 ◽  
pp. 01005
Author(s):  
Weiwei Sun ◽  
Dina D’Ayala ◽  
Jinxing Fu ◽  
Wentao Gu ◽  
Jun Feng
Keyword(s):  
Dynamic Analysis ◽  
Molten Salt ◽  
Seismic Performance ◽  
Vulnerability Assessment ◽  
Seismic Vulnerability ◽  
Incremental Dynamic Analysis ◽  
Seismic Excitations ◽  
Ground Acceleration ◽  
Seismic Vulnerability Assessment ◽  
High Rise

This paper investigates the seismic performance of a high-rise molten-salt solar tower by finite element modelling. The integrated and separated models for solar tower based on the concrete damage plastic model are validated by matching the behaviour of similar reinforced concrete chimney specimens. The modal analysis demonstrates the first four modes of the solar tower are translational vibration. Seismic simulations are developed through the incremental dynamic analysis. The most disadvantageous position of the tower is all concentrated in the opening section under multidirectional seismic excitations. The top displacement of the tower under bidirectional and three-directional earthquake actions is larger than that under unidirectional earthquake actions. The results of the seismic vulnerability assessment show that when the PGA equals to 0.035g, the tower will be intact; when the PGA equals to 0.1g (design peak ground acceleration), the probability of the moderate damage state is within 1.5%; when the PGA equals to 0.22g (maximum considered earthquake), the probability of the destruction state is below 0.7%. The seismic partitioned fragility analysis of the tower under multidirectional earthquake excitations illustrates that there are two peaks in the vulnerability surfaces. The anti-collapse analysis indicates the tower has a good seismic performance under multidirectional seismic excitations.

scholarly journals A New Mathematical Modeling Method for Four-Stage Helicopter Main Gearbox and Dynamic Response Optimization

Complexity ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-13 ◽  
Author(s):  
Yuan Chen ◽  
Rupeng Zhu ◽  
Guanghu Jin ◽  
Yeping Xiong ◽  
Jie Gao ◽  
...  
Keyword(s):  
Mathematical Modeling ◽  
Sensitivity Analysis ◽  
Dynamic Response ◽  
Dynamic Model ◽  
Structural Parameters ◽  
Modeling Method ◽  
System Response ◽  
Analysis Method ◽  
Lumped Mass ◽  
Sensitivity Analysis Method

A new mathematical modeling method, namely, the finite element method and the lumped mass method (LMM-FEM) mixed modeling, is applied to establish the overall multinode dynamic model of a four-stage helicopter main gearbox. The design of structural parameters of the shaft is the critical link in the four-stage gearbox; it affects the response of multiple input and output branches; however, only the meshing pairs were frequently shown in the dynamic model in previous research. Therefore, each shaft is also treated as a single node and the shaft parameters are coupled into the dynamic equations in this method, which is more accurate for the transmission chain. The differential equations of the system are solved by the Fourier series method, and the dynamic response of each meshing element is calculated. The sensitivity analysis method and parameter optimization method are applied to obtain the key shaft parameters corresponding to each meshing element. The results show that the magnitude of dynamic response in converging meshing pair and tail output pair is higher than that of other meshing pairs, and the wall thickness has great sensitivity to a rotor shaft. In addition, the sensitivity analysis method can be used to select the corresponding shaft node efficiently and choose parameters appropriately for reducing the system response.

A stochastic model for site ground motions from temporally dependent earthquakes

1987 ◽  
Vol 77 (4) ◽  
pp. 1110-1126
Author(s):  
Anne S. Kiremidjian ◽  
Shigeru Suzuki
Keyword(s):  
Seismic Hazard ◽  
Stochastic Model ◽  
Ground Motion ◽  
Ground Motions ◽  
Large Earthquake ◽  
Fault System ◽  
Seismic Gap ◽  
Attenuation Relationship ◽  
Ground Acceleration ◽  
A Site

Abstract A stochastic model is presented for estimating probabilities of exceeding site ground motions due to temporally dependent earthquake events. The model reflects the hypothesized dependence of the size of large earthquake events on the time of occurrence of the last major earthquake. An empirical attenuation relationship is used to describe the ground motion at a site originating from a well-defined fault system. The application of the model to the Middle America Trench is discussed. The seismic hazard potential in Mexico City is computed in terms of probabilities of exceeding peak ground acceleration levels. The results indicate that consideration of the seismic gap is important for estimating the seismic hazard at a site. It is also observed that site hazard estimates are greatly dependent on the specific attenuation relationship used. The need for other approaches of ground motion estimation is recognized.

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